CN101408212A - Energy recovery system of hybrid power engineering machinery actuating element - Google Patents
Energy recovery system of hybrid power engineering machinery actuating element Download PDFInfo
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- 230000011664 signaling Effects 0.000 claims description 9
- 238000012360 testing method Methods 0.000 claims description 3
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- 238000001514 detection method Methods 0.000 abstract 1
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- 239000003921 oil Substances 0.000 description 47
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- 238000004146 energy storage Methods 0.000 description 5
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Abstract
The invention discloses an energy recovery system of a hybrid power engineering mechanical implementation element, mainly comprising two variable frequency motors, two rectifiers/inverters, an engine, a variable pump, a variable motor, an accumulator, a proportional direction valve, a signal control unit, a battery and an oil cylinder. The signal control unit obtains a control signal from a control handle, obtains a detection signal from three pressure sensors and sends out a control instruction to the engine, the proportional direction valve, the variable pump, the variable motor, the two rectifiers/inverters and a proportional relief valve so as to control the throttle position signal of the engine, the valve core displacement of the proportional direction valve, the displacement of the variable pump, the displacement of the variable motor, the rotating speed of the two variable frequency motors, and the valve core displacement of the proportional relief valve, thus controlling the action of the oil cylinder. The system enhances the dynamic response performance of the energy recovery system, improves the working conditions of power generation of an electric generator, raises the energy recovery efficiency of the system, and lowers the requirements of the system to the specific power of the battery.
Description
Technical field
The present invention relates to the hydraulic control system that electrohydraulic control technology is a feature, especially relate to a kind of energy-recuperation system of hybrid power engineering machinery actuating element.
Background technique
Along with being on the rise of energy shortage in the world wide and environmental pollution problem, the power saving of research engineering machinery has important practical significance.
The lifting and transfer weight repeatedly of actuator in the engineering machinery, and each mechanical arm inertia of engineering machinery is bigger, when mechanical arm descends or brakes, can discharge lot of energy, in traditional engineering machinery, this part energy is difficult to reclaim, stores and utilizes, has not only caused the waste of the energy, also can cause harm such as heating, noise, vibration and reduction life-span.If can and utilize again this part energy recovery, can improve the capacity usage ratio of engineering machinery, thereby reduce its energy consumption.
Introduce mixed power system in engineering machinery, owing to possess energy storage devices such as battery or electric capacity in the power system, the recovery of energy and storage all are easy to realize.When engineering machinery actuating element fall time is longer, utilize the oil back chamber of oil hydraulic cylinder to link to each other with an oil hydraulic motor, this oil hydraulic motor and generator coaxle link.The hydraulic oil of hydraulic actuator oil back chamber drives the oil hydraulic motor revolution, hydraulic pressure can be converted into mechanical energy output, and drive generator for electricity generation, and the three phase current electric energy is direct current energy and is stored in the energy-storage travelling wave tube through rectification/inverter rectification.When system needed, direct current can be reverse into three phase current electric energy drive motor, drove load jointly with motor.But when fall time of engineering machinery actuating element more in short-term, with the excavator swing arm is example, have only 2～3 seconds its fall time, if only adopt the energy-recuperation system of oil hydraulic motor and generator, the frequency response of energy-recuperation system is difficult to reach the frequency response requirement of engineering machinery actuating element, thereby influence the operating characteristics of system, the generator in the energy-recuperation system is subjected to the influence of load big ups and downs simultaneously, and reuse efficiency is lower.
Summary of the invention
In order to reduce the restriction loss of hydraulic control valve, improve the efficient of energy-recuperation system, do not influence simultaneously the operating characteristics of engineering machinery actuator, the object of the present invention is to provide a kind of energy-recuperation system of hybrid power engineering machinery actuating element, utilize oil hydraulic motor that above-mentioned energy is reclaimed, and the anti-operating mode operation of passing through motor is generated electricity, electric energy feedback or storage are utilized again, utilize the frequency response of the rapidity that specific power is big and energy storage the discharges raising energy-recuperation system of accumulator simultaneously, utilize the mild fluctuation of load of accumulator to improve the generator for electricity generation operating mode, improve the reuse efficiency of system.
For achieving the above object, the present invention adopt technological scheme as follows:
The present invention includes two variable-frequency motors, two rectification/inverters, motor, variable displacement pump, variable displacement motor, accumulator, stop valve, solenoid directional control valve, proportion directional valve, two one-way valves, proportional pressure control valve, safety valve, three pressure transducers, Joystick, signaling control unit, battery and oil cylinders; Its interconnected relationship is as follows:
Motor, variable displacement pump and first variable-frequency motor is coaxial links; Variable displacement motor and second frequency conversion coaxial linking to each other of electricity; First variable-frequency motor connects first rectification/inverter, and second variable-frequency motor connects second rectification/inverter; Two rectification/inverters connect battery; The first variable delivery side of pump connects the filler opening of first one-way valve, the oil outlet of first one-way valve divides four the tunnel, and the first via connects the filler opening of proportional pressure control valve, and the second the tunnel connects the P mouth of proportion directional valve, Third Road connects the input end of first pressure transducer, and the four the tunnel connects the safety valve filler opening; The A mouth of proportion directional valve divides two-way, and the first via connects the rodless cavity of oil cylinder, and the second the tunnel connects the input end of second pressure transducer; The B mouth connects the rod chamber of oil cylinder, and the T mouth connects the P mouth of solenoid directional control valve; The A mouth of solenoid directional control valve divides four the tunnel, and the first via connects accumulator behind stop valve, and the second the tunnel connects the input end of the 3rd pressure transducer, and Third Road connects the filler opening of first variable displacement motor, the oil outlet connected tank of first variable displacement motor; The four the tunnel connects the oil outlet of second one-way valve, the filler opening connected tank of second one-way valve; Signaling control unit obtains control signal from Joystick, obtain testing signal from first, second, third pressure transducer, send the throttle position signal of control command control motor, valve core displacement, variable pump delivery, the discharge capacity of variable displacement motor, the rotating speed of first, second variable-frequency motor and the valve core displacement of proportional pressure control valve of proportion directional valve to motor, proportion directional valve, variable displacement pump, variable displacement motor, first, second rectification/inverter, proportional pressure control valve, thus the action of control oil cylinder.
The present invention compares with background technique, has useful effect to be:
1, system adopts the electric weight energy storage apparatus of mixed power system, adopted the energy-recuperation system of oil hydraulic motor-generator-battery, the potential energy that the decline of engineering machinery actuator is discharged changes into electric energy, when system needs, electric energy is reverse into the three phase current electric energy drive motor of target frequency by rectifier, drives load (oil hydraulic pump) work jointly with motor.
2, the specific power of accumulator is higher, the rapidity requirement that can satisfy the energy storage and discharge, when engineering machinery actuator descends, can in the short time, absorb the energy that actuator discharges fast, solve the lower problem of energy-recuperation system dynamic response that adopts oil hydraulic motor and generator to form.
3, system adopts accumulator, and the fluctuation of buffer load improves the generating operation mode of generator, has improved energy recovery efficiency.
4, after system adopts accumulator, when engineering machinery actuator descends, utilize to need the energy that can device can the fast Absorption engineering machinery discharges, when rising, actuator discharges the recovered energy that continues to drive oil hydraulic motor-generator, prolong the energy recovery time, prolonged the duration of charge of electric weight storage device, improved the energy recovery efficiency of system, reduced requirement, overcome the lower defective of battery specific power electric weight storage device specific power.
5, because the specific energy of accumulator is lower, the accumulator of the energy-recuperation system of employing accumulator is bulky, this is unaccommodated to the limited engineering machinery in space, the present invention has adopted accumulator and the compound energy-recuperation system of oil hydraulic motor-generator, the energy that when engineering machinery actuator descends, discharges, accumulator and oil hydraulic motor-generator be recovered energy simultaneously, and the energy that discharges in the accumulator absorption portion mechanical arm decline process has reduced the capacity of accumulator.
Description of drawings
Accompanying drawing is a structural principle schematic representation of the present invention.
Among the figure: 1, variable displacement motor, 2, variable-frequency motor, 3, rectification/inverter, 4, battery 5, rectification/inverter, 6, variable-frequency motor, 7, variable displacement pump, 8, motor, 9, one-way valve, 10, proportional pressure control valve, 11, pressure transducer, 12, safety valve, 13, solenoid directional control valve, 14, proportion directional valve, 15, oil cylinder, 16, pressure transducer, 17, accumulator, 18, stop valve, 19, Joystick, 20, pressure transducer, 21, signaling control unit, 22, one-way valve.
Embodiment
Below in conjunction with accompanying drawing, provide details of the present invention by description to embodiment.
As shown in drawings, the present invention includes two variable- frequency motors 2,6, two rectification/ inverters 3,5, motor 8, variable displacement pump 7, variable displacement motor 1, accumulator 17, stop valve 18, solenoid directional control valve 13, proportion directional valve 14, two one- way valves 9,22, proportional pressure control valve 10, safety valve 12, three pressure transducers 11,16,20, Joystick 19, signaling control unit 21, battery 4 and oil cylinder 15; Its interconnected relationship is as follows:
Working principle of the present invention is as follows:
21 pairs of signaling control units carry out data processing by pressure transducer 11 output signals, obtain induced pressure, by pressure transducer 16 and 20 output signals are carried out data processing, obtain the A mouth of proportion directional valve 14, the port pressure difference signal of T mouth, carry out data processing by control signal simultaneously, obtain the target velocity of oil cylinder 15 Joystick 19; Thereby send the action of control command control oil cylinder 15 to motor 8, proportion directional valve 14, variable displacement pump 7, variable displacement motor 1, rectification/ inverter 3 and 5, proportional pressure control valve 10.
When control signal for just, specific as follows:
1) proportion directional valve 14 right laterals, solenoid directional control valve 13 left lateral, variable displacement pump 7 high hydraulic oil enter oil cylinder 15 rodless cavities by P mouth, the A mouth of one-way valve 9, proportion directional valve 14, promote oil cylinder 15 risings and lift weight; The hydraulic oil of oil cylinder 15 rod chambers is through the B mouth oil sump tank of the B of proportion directional valve 14 mouth and T mouth, solenoid directional control valve 13.This moment, system controlled oil cylinder 15 rates of climb by the spool travel of regulating proportion directional valve 14, was in the entrance throttle governing circuit state;
2) mixed power system be made up of motor 8 and variable-frequency motor 6 of variable displacement pump 7 drives jointly.Motor 8 provides the average power of load, and when bearing power during greater than the output power of motor 8, variable-frequency motor 6 is operated in motoring condition, and variable displacement pump 7 is driven jointly by motor 8 and variable-frequency motor 6, and battery 4 is in discharge condition; When bearing power during less than the output power of motor 8, variable-frequency motor 6 is operated in generating state, motor 8 drives variable displacement pump 7, drives variable-frequency motor 6 simultaneously the unnecessary energy of motor output is changed into electrical power storage in battery 4, and battery 4 is in charged state.
When control signal is negative, specific as follows:
1) proportion directional valve 14 left lateral, solenoid directional control valve 13 right laterals, motor 8 is in the auto idle speed state, and variable-frequency motor 6 is in and stops idling conditions, and variable displacement pump 7 hydraulic oil enter oil cylinder 15 rod chambers by the P mouth and the B mouth of one-way valve 9, proportion directional valve 14; The hydraulic oil of oil cylinder 15 rodless cavities connects the energy recovery oil hydraulic circuit of being made up of accumulator 17 and variable displacement motor 1 through the P mouth of the A of proportion directional valve 14 mouth and T mouth, solenoid directional control valve 13.This moment, oil cylinder 15 was in the decline process, system signal control unit 21 is according to the input signal of pressure transducer 16 and 20, operating grip 19, calculate the spool travel signal of proportion directional valve 14, send the rate of descent that control signal is controlled oil cylinder 15 to proportion directional valve 14.
2) longer if oil cylinder 15 is transferred the time, then close stop valve 18, the all hydraulic of the rodless cavity of oil cylinder 15 can drive variable displacement motor 1 and change into mechanical energy, and coaxial variable-frequency motor 2 generatings of drive and variable displacement motor 1, is that direct current energy is stored in the battery 4 through 2 rectifications of rectification/inverter;
3) shorter if oil cylinder 15 is transferred the time, then open stop valve 18, because the time compole short (excavator swing arm about 2S fall time) that oil cylinder 15 descends, the part hydraulic pressure that whole cylinder 15 decline processes discharge can directly be absorbed by accumulator 17, part hydraulic pressure can drive variable displacement motor 1 and change into mechanical energy, and coaxial variable-frequency motor 2 generatings of drive and variable displacement motor 1, be that direct current energy is stored in the battery 4 through 3 rectifications of rectification/inverter; Treat that oil cylinder decline process finishes the back to the time that oil cylinder 15 descends next time, the hydraulic pressure of accumulator 17 can discharge, drive variable displacement motor 1 and change into mechanical energy, and drive and variable displacement motor 1 coaxial variable-frequency motor 2 generating electricity, is that direct current energy is stored in the battery 4 through 3 rectifications of rectification/inverter;
More than, two rectification/inverters 3 that the present invention relates to and 5, battery 4 can be chosen in market as required.Signaling control unit 21 can adopt the PLC programmable logic controller (PLC).
Claims (1)
1, a kind of energy-recuperation system of hybrid power engineering machinery actuating element, it is characterized in that: comprise two variable-frequency motors (2,6), two rectification/inverters (3,5), motor (8), variable displacement pump (7), variable displacement motor (1), accumulator (17), stop valve (18), solenoid directional control valve (13), proportion directional valve (14), two one-way valves (9,22), proportional pressure control valve (10), safety valve (12), three pressure transducers (11,16,20), Joystick (19), signaling control unit (21), battery (4) and oil cylinder (15); Its interconnected relationship is as follows:
Motor (8), variable displacement pump (7) and coaxial the linking of first variable-frequency motor (6); Variable displacement motor (1) and coaxial linking to each other of second variable-frequency motor (2); First variable-frequency motor (6) connects first rectification/inverter (5), and second variable-frequency motor (2) connects second rectification/inverter (3); Two rectification/inverters (3,5) connect battery (4); The outlet of first variable displacement pump (7) connects the filler opening of first one-way valve (9), the oil outlet of first one-way valve (9) divides four the tunnel, the first via connects the filler opening of proportional pressure control valve (10), the second the tunnel connects the P mouth of proportion directional valve (14), Third Road connects the input end of first pressure transducer (11), and the four the tunnel connects safety valve (12) filler opening; The A mouth of proportion directional valve (14) divides two-way, and the first via connects the rodless cavity of oil cylinder (15), and the second the tunnel connects the input end of second pressure transducer (16); The B mouth connects the rod chamber of oil cylinder (15), and the T mouth connects the P mouth of solenoid directional control valve (13); The A mouth of solenoid directional control valve (13) divides four the tunnel, the first via connects accumulator (17) behind stop valve (18), the second the tunnel connects the input end of the 3rd pressure transducer (20), and Third Road connects the filler opening of first variable displacement motor (1), the oil outlet connected tank of first variable displacement motor (1); The four the tunnel connects the oil outlet of second one-way valve (22), the filler opening connected tank of second one-way valve (22); Signaling control unit (21) obtains control signal from Joystick (19), from first, second, the 3rd pressure transducer (11,16,20) obtain testing signal, to motor (8), proportion directional valve (14), variable displacement pump (7), variable displacement motor (1), first, second rectification/inverter (5,3), proportional pressure control valve (10) sends the throttle position signal of control command control motor (8), the valve core displacement of proportion directional valve (14), the discharge capacity of variable displacement pump (7), the discharge capacity of variable displacement motor (1), first, second variable-frequency motor (6, the valve core displacement of rotating speed 2) and proportional pressure control valve (10), thereby the action of control oil cylinder (15).
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| CNA2008101220751A CN101408212A (en) | 2008-10-31 | 2008-10-31 | Energy recovery system of hybrid power engineering machinery actuating element |
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| CN101956405A (en) * | 2010-07-15 | 2011-01-26 | 吉林大学 | Gravitational potential energy recovery device during descending of engineering machinery movable arm |
| CN101973271A (en) * | 2010-10-28 | 2011-02-16 | 湖南山河智能机械股份有限公司 | Driving and energy recovery system for hybrid excavator |
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| CN102155160A (en) * | 2011-01-29 | 2011-08-17 | 湖南山河智能机械股份有限公司 | Hybrid rotary drilling machine |
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